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1,809 Matching Results
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Effects of radiation on laser diodes.
The effects of ionizing and neutron radiation on the characteristics and performance of laser diodes are reviewed, and the formation mechanisms for nonradiative recombination centers, the primary type of radiation damage in laser diodes, are discussed. Additional topics include the detrimental effects of aluminum in the active (lasing) volume, the transient effects of high-dose-rate pulses of ionizing radiation, and a summary of ways to improve the radiation hardness of laser diodes. Radiation effects on laser diodes emitting in the wavelength region around 808 nm are emphasized.
Date:
September 1, 2004
Creator:
Phifer, Carol Celeste
Object Type:
Report
System:
The UNT Digital Library
Electrical Properties of InALP Native Oxides for Metal-Oxide-Semiconductor Device Applications
Data are presented on the insulating properties and capacitance-voltage (CV) characteristics of metal-oxide-semiconductor (MOS) device-thickness (below approx. 100 nm) native oxides formed by wet thermal oxidation of thin InAlP epilayers lattice matched to GaAs. Low leakage current densities of J=1.4 x 10-9 A/cm2 and J=8.7 x 10-11 A/cm2 are observed at an applied field of 1 MV/cm for MOS capacitors fabricated with 17 nm and 48 nm oxides, respectively. TEM images show that the In-rich interfacial particles which exist in 110 nm oxides are absent in 17 nm oxide films. Quasi-static capacitance-voltage measurements of MOS capacitors fabricated on both n-type and p-type GaAs show that the InAlP oxide-GaAs interface is sufficiently free of traps to support inversion, indicating an unpinned Fermi level. These data suggest that InAlP native oxides may be a viable insulator for GaAs MOS device applications.
Date:
September 1, 2004
Creator:
Cao, Y.; Zhang, J.; Li, X.; Kosel, T. H.; Fay, P.; Hall, D. C. et al.
Object Type:
Article
System:
The UNT Digital Library
Energy Savings Performance Contracts: Reauthorization Issues
This report reviews the legislative history of ESPCs, the federal program to promote them, the Congressional Budget Office's (CBO's) scoring rationale, and ESPCs' cost and benefits.
Date:
September 1, 2004
Creator:
Andrews, Anthony
Object Type:
Report
System:
The UNT Digital Library
Estancia Basin dynamic water budget.
The Estancia Basin lies about 30 miles to the east of Albuquerque, NM. It is a closed basin in terms of surface water and is somewhat isolated in terms of groundwater. Historically, the primary natural outlet for both surface water and groundwater has been evaporation from the salt lakes in the southeastern portion of the basin. There are no significant watercourses that flow into this basin and groundwater recharge is minimal. During the 20th Century, agriculture grew to become the major user of groundwater in the basin. Significant declines in groundwater levels have accompanied this agricultural use. Domestic and municipal use of the basin groundwater is increasing as Albuquerque population continues to spill eastward into the basin, but this use is projected to be less than 1% of agricultural use well into the 21st Century. This Water Budget model keeps track of the water balance within the basin. The model considers the amount of water entering the basin and leaving the basin. Since there is no significant surface water component within this basin, the balance of water in the groundwater aquifer constitutes the primary component of this balance. Inflow is based on assumptions for recharge made by earlier researchers. Outflow …
Date:
September 1, 2004
Creator:
Thomas, Richard P.
Object Type:
Report
System:
The UNT Digital Library
EVALUATION OF FOAMING/ANTIFOAMING IN WTP TANKS EQUIPPED WITH PULSE JET MIXERS AND AIR SPARGERS
The foaminess of Hanford waste samples [i.e., pretreated AN-104 Hanford sample--post ion exchange and AN-104 blended with Submerged Bed Scrubber (SBS) recycle, then evaporated to 5 M Na] and waste simulants AP-101, AN-104, and AZ-101 was determined using an air-sparged foam column (3.1 cm inside diameter x 60 cm height). The Hanford waste samples AN-104 post ion exchange solution and AN-104/SBS recycle solution, and the simulants AP-101 and AN-104, were mixed with different weight percents of AY-102/ C-106 sludge to determine the effect of insoluble particles. The AN-104 Hanford samples have shown a tendency to foam when subjected to air sparging. The percent foaminess, defined as [100 (volume fraction of gas entrained liquid and foam)--(volume fraction of gas entrained liquid)], increased to a well-defined maximum with the increase of the amount of solid particles added to solution. For example, at a sparge rate of 4.4 ft3/min/ft2, the foaminess of an air-sparged AN-104/SBS recycle sample with no added insoluble solid particles was 80 percent vs. 95 percent for 12 wt. percent insoluble solids concentration in the sample. A more dramatic foaminess was observed for an AN-104 Hanford sample that was pretreated in ion exchange columns. The foaminess for this sample (no …
Date:
September 1, 2004
Creator:
JONES, TIMOTHYM.
Object Type:
Report
System:
The UNT Digital Library
Evaluation of replacement protocols and modifications to TCP to enhance ASC Wide Area Network performance.
Historically, TCP/IP has been the protocol suite used to transfer data throughout the Advanced Simulation and Computing (ASC) community. However, TCP was developed many years ago for an environment very different from the ASC Wide Area Network (WAN) of today. There have been numerous publications that hint of better performance if modifications were made to the TCP algorithms or a different protocol was used to transfer data across a high bandwidth, high delay WAN. Since Sandia National Laboratories wants to maximize the ASC WAN performance to support the Thor's Hammer supercomputer, there is strong interest in evaluating modifications to the TCP protocol and in evaluating alternatives to TCP, such as SCTP, to determine if they provide improved performance. Therefore, the goal of this project is to test, evaluate, compare, and report protocol technologies that enhance the performance of the ASC WAN.
Date:
September 1, 2004
Creator:
Romero, Randy L. Jr.
Object Type:
Report
System:
The UNT Digital Library
An evaluation of technologies for real-time measurement of rates of outdoor airflow into HVAC systems
During the last few years, new technologies have been introduced for real-time continuous measurement of the flow rates of outdoor air (OA) into HVAC systems; however, an evaluation of these measurement technologies has not previously been published. This document describes a test system and protocols developed for a controlled evaluation of these measurement technologies. The results of tests of four commercially available measurement technologies and one prototype based on a new design are also summarized. The test system and protocol were judged practical and very useful. The series of tests identified three commercially available measurement technologies that should provide reasonably accurate measurements of OA flow rates as long as air velocities are maintained high enough to produce accurately measurable pressure signals. In HVAC systems with economizer controls, to maintain the required air velocities the OA intake will need to be divided into two sections in parallel, each with a separate OA damper. The errors in OA flow rates measured with the fourth commercially available measurement technology were 20% to 30% with horizontal probes but much larger with vertical probes. The new prototype measurement technology was the only one that appears suitable for measuring OA flow rates over their full range …
Date:
September 1, 2004
Creator:
Fisk, William J.; Faulkner, David & Sullivan, Douglas P.
Object Type:
Report
System:
The UNT Digital Library
An Evaluation of the Nonlinearity Correction Applied to Atmospheric Emitted Radiance Interferometer (AERI) Data Collected by the Atmospheric Radiation Measurement Program
Mercury Cadmium Telluride (MCT) detectors provide excellent sensitivity to infrared radiation and are used in passive infrared remote sensors such as the Atmospheric Emitted Radiance Interferometer (AERI). However, MCT detectors have a nonlinear response and thus this nonlinearity must be characterized and corrected to provide accurate infrared radiance observations. This paper discusses the significance of the nonlinearity correction applied to AERI data and its impacts on the parameters retrieved from the AERI spectra. It also evaluates the accuracy of the scheme used to determine the nonlinearity of the MCT detectors used in the Atmospheric Radiation Measurement (ARM) Program’s AERIs.
Date:
September 1, 2004
Creator:
Turner, D. D.; Revercomb, H. E.; Knuteson, R. O.; Dedecker, R. G. & Feltz, W. F.
Object Type:
Report
System:
The UNT Digital Library
Experimental Investigation of Magnetic Superconducting and other Phase Transitions in Novel f-Electron Materials at Ultra-high Pressures using Designer Diamond Anvils
Pressure is often used as a controlled parameter for the investigation of condensed matter systems. In particular, pressure experiments can provide valuable information into the nature of superconductivity, magnetism, and the coexistence of these two phenomena. Some f-electron, heavy-fermion materials display interesting and novel behavior at moderately low pressures achievable with conventional experimental techniques; however, a growing number of condensed matter systems require ultrahigh pressure techniques, techniques that generate significantly higher pressures than conventional methods, to sufficiently explore their important properties. To that end, we have been funded to develop an ultrahigh pressure diamond anvil cell facility at the University of California, San Diego (UCSD) in order to investigate superconductivity, magnetism, non-Fermi liquid behavior, and other phenomena. Our goals for the first year of this grant were as follows: (a) set up and test a suitable refrigerator; (b) set up a laser and spectrometer fluorescence system to determine the pressure within the diamond anvil cell; (c) perform initial resistivity measurements at moderate pressures from room temperature to liquid helium temperatures ({approx}1K); (d) investigate f-electron materials within our current pressure capabilities to find candidate materials for high-pressure studies. During the past year, we have ordered almost all the components required to …
Date:
September 1, 2004
Creator:
Maple, M. Brian; Jeffries, Jason R.; Ho, Pei-Chun & Butch, Nicholas P.
Object Type:
Report
System:
The UNT Digital Library
The Express-Star (Chickasha, Okla.), Ed. 1 Wednesday, September 1, 2004
Daily newspaper from Chickasha, Oklahoma that includes local, state, and national news along with advertising.
Date:
September 1, 2004
Creator:
Bush, Kent
Object Type:
Newspaper
System:
The Gateway to Oklahoma History
FCC Record, Volume 19, No. 21, Pages 16999 to 17677, August 30 - September 3, 2004
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
September 2004
Creator:
United States. Federal Communications Commission.
Object Type:
Book
System:
The UNT Digital Library
FCC Record, Volume 19, No. 22, Pages 17678 to 18534, September 7 - September 17, 2004
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
September 2004
Creator:
United States. Federal Communications Commission.
Object Type:
Book
System:
The UNT Digital Library
FCC Record, Volume 19, No. 23, Pages 18535 to 19452, September 20 - September 30, 2004
Biweekly, comprehensive compilation of decisions, reports, public notices, and other documents of the U.S. Federal Communications Commission.
Date:
September 2004
Creator:
United States. Federal Communications Commission.
Object Type:
Book
System:
The UNT Digital Library
Feasibility analysis for attosecond X-ray pulses at FERMI@ELETTRA free electron laser
We present preliminary analysis for the feasibility of the attosecond x-ray pulses at a proposed FERMI@ELETTRA free electron laser (FEL) [1]. In part 1 we restrict ourselves to minimal modifications to the proposed FEL and consider a scheme for attosecond x-ray production which can be qualified as a small add-on to a primary facility. We demonstrate that at 5-nm wavelength our scheme is capable for production of pulses with an approximate duration of 100 attoseconds at approximately 2 MW peak power and with an absolute temporal synchronization to a pump laser pulse. In part 2 we propose to use an FEL amplifier seeded by a VUV signal and to follow it by the scheme for attosecond x-ray production described in part 1.
Date:
September 1, 2004
Creator:
Zholents, Alexander
Object Type:
Report
System:
The UNT Digital Library
Field Demonstration of a Membrane Process to Separate Nitrogen From Natural Gas Progress Report
The original proposal described the construction and operation of a 1 MMscfd treatment system to be operated at a Butcher Energy gas field in Ohio. The gas produced at this field contained 17% nitrogen. During pre-commissioning of the project, a series of well tests showed that the amount of gas in the field was significantly smaller than expected and that the nitrogen content of the wells was very high (25 to 30%). After evaluating the revised cost of the project, Butcher Energy decided that the plant would not be economical and withdrew from the project. Since that time, Membrane Technology and Research, Inc. (MTR) has signed a marketing and sales partnership with ABB Lummus Global, a large multinational corporation. MTR will be working with the company's Randall Gas Technology group, a supplier of equipment and processing technology to the natural gas industry. Randall's engineering group has found a new site for the project at a North Texas Exploration (NTE) gas processing plant. The plant produces about 1 MMscfd of gas containing 24% nitrogen. The membrane unit will bring this gas to 4% nitrogen for delivery to the pipeline. The membrane skid is being built by ABB. NTE has ordered the …
Date:
September 1, 2004
Creator:
Lokhandwala, Kaaeid
Object Type:
Report
System:
The UNT Digital Library
Fifth International Symposium On Radiohalogens
None
Date:
September 1, 2004
Creator:
Wilbur, D. Scott
Object Type:
Article
System:
The UNT Digital Library
Final Report
The research funded by this grant yielded 20 papers with the P.I as the main author or a co-author. In this report, a brief outline of the completed projects is given.
Date:
September 1, 2004
Creator:
Cioslowski,J.
Object Type:
Report
System:
The UNT Digital Library
Final Report - Gas Retention and Release Tests Supporting the Concentrate Receipt Vessel (CRV-VSL-00002A/2B) Configuration
Gas Retention and Release (GR and R) tests were performed in the scaled Concentrate Receipt Vessel (CRV) Test Stand at the Savannah River National Laboratory to validate the capability of candidate Hybrid-Mixing systems for the CRV to safely release hydrogen during normal and upset conditions. Hydrogen is generated in the radioactive waste as a result of natural and plant processes and must not be allowed to accumulate above flammability limits. Two types of tests were conducted. Gas holdup tests determined the steady state amount of gas accumulated in the simulant under normal PJM only or PJM plus sparging conditions. Gas release tests determined what operating conditions are necessary to fully release gas after a steady state gas fraction of 4 per cent tank volume or more was reached in the simulant.
Date:
September 1, 2004
Creator:
GUERRERO, HECTOR
Object Type:
Report
System:
The UNT Digital Library
FINAL REPORT - HYBRID-MIXING TESTS SUPPORTING THE CONCENTRATE RECEIPT VESSEL (CRV-VSL-00002A/2B) CONFIGURATION
The Savannah River National Laboratory (SRNL) has performed scaled physical modeling of Pulse Jet Mixing Systems applicable to the Concentrate Receipt Vessel (CRV) of Hanford's Waste Treatment Plant (WTP) as part of the overall effort to validate pulse jet mixer (PJM) mixing in WTP vessels containing non-Newtonian fluids. The strategy developed by the Pulse Jet Mixing Task Team was to construct a quarter-scale model of the CRV, use a clear simulant to understand PJM mixing behavior, and down-select from a number of PJM configurations to a ''best design'' configuration. This ''best design'' would undergo final validation testing using a particulate simulant that has rheological properties closely similar to WTP waste streams. The scaled PJM mixing tests were to provide information on the operating parameters critical for the uniform movement (total mobilization) of these non-Newtonian slurries. Overall, 107 tests were performed during Phase I and Phase II testing.
Date:
September 1, 2004
Creator:
GUERRERO, HECTORN.
Object Type:
Report
System:
The UNT Digital Library
Finders Keepers, Volume 2, Number 3, September 2004
The quarterly newsletter of Johnson County Genealogical Society contains information related to the activities of the society and its members as well as genealogical notes and history for the Johnson County, Texas and surrounding areas.
Date:
September 2004
Creator:
Johnson County Genealogical Society (Tex.)
Object Type:
Journal/Magazine/Newsletter
System:
The Portal to Texas History
Flag Protection: A Brief History and Summary of Recent Supreme Court Decisions and Proposed Constitutional Amendment
The first part of the report gives a brief history of the flag protection issue, from the enactment of the flag protection act in 1968 through consideration of a constitutional amendment. The second part briefly summarizes the two decisions of the United States Supreme court.
Date:
September 1, 2004
Creator:
Luckey, John
Object Type:
Report
System:
The UNT Digital Library
Flag Protection: A Brief History and Summary of Recent Supreme Court Decisions and Proposed Constitutional Amendment
This report is divided into two parts. The first gives a brief history of the flag protection issue, from the enactment of the Flag Protection Act in 1968 through current consideration of a constitutional amendment. The second part briefly summarizes the two decisions of the United States Supreme Court, Texas v. Johnson and United States v. Eichman, that struck down the state and federal flag protection statutes as applied in the context punishing expressive conduct.
Date:
September 1, 2004
Creator:
Luckey, John R.
Object Type:
Report
System:
The UNT Digital Library
[Flagged motorcycle group: Lone Star Ride 2004 event photo]
Photograph of three individuals, who are wearing orange Lone Star Ride t-shirts and leather jackets. One individual is wearing an orange and yellow reflector vest. They are posing behind a motorcycle that is decorated with the Texas and rainbow flag. Yosemite Sam plush doll is also hanging from the wood post.
Date:
September 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library
[Four riders stopped contemplating directions: Lone Star Ride 2004 event photo]
Photograph of four riders leaning sitting on their bikes as one gestures (middle left). A park area with a sports field appears directly behind the riders.
Date:
September 2004
Creator:
unknown
Object Type:
Photograph
System:
The UNT Digital Library